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Doctor insights on: Allegra Allergy Side Effects

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Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Why will happen if you take a Claritin (loratadine) 24 hour and then 12 hours later take an allegra allergy pill?

Not serious: Since it takes several doses of a medication to get therapeutic levels, taking a second allergy medication too soon should not have any bad effects. You may have a few more side effects. ...Read more

Dr. John Chiu
2,586 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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Can I take Advil Sinus Congestion and Pain with Allegra Allergy 24 hour together? I have a cold with nasal congestion.

Can I take Advil Sinus Congestion and Pain with Allegra Allergy 24 hour together? I have a cold with nasal congestion.

No benefit: Yes, but there is no added benefit to take the Allegra (fexofenadine) since it doesn't help much when you have a cold. An older antihistamine like Chlorpheneramine may help with runny nose but may cause drowsiness. ...Read more

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I started taking allegra (fexofenadine) d for my allergies my appetite decreased. Is this one of its side effects?

I started taking allegra (fexofenadine) d for my allergies my appetite decreased. Is this one of its side effects?

Could be related: Allegra (fexofenadine) d has not been usually associated with decreased appetite.The Pseudoephedrine which is the d part of the Allegra (fexofenadine) d can cause nausea in very few patients and if that is the symptom you are experiencing then you wont experience this with plain allegra (fexofenadine). ...Read more

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Are there any negative side effects if i take one 180mg allegra (fexofenadine) tablet daily for years? I have allergies all yr.

Are there any negative side effects if i take one 180mg allegra (fexofenadine) tablet daily for years? I have allergies all yr.

Probably not, but: New generation antihstamines are in general safe and effective. However, the best treatment for year round allergies is 1) avoidance of the allergic trigger; 2) antihistamines like allegra; 3) topical nasal steroid sprays (most effective); 4) allergy injections--will provide relief in majority of people and decrease need for medications. ...Read more

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What are the side effects of allegra (fexofenadine hcl) ?

Less common: All medications have side effects. Fexofenadine (allegra) is a newer or second generation anti-histamine. It does not cause usual side effects associated with older or first generation antihistamines such as drowsiness, dry mouth, urinary retention or palpitations. Some sensitive persons complains of mild drowsiness. Other listed side effects include headache, heart burn, muscle pain, somnolence. ...Read more

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Allegra-d side effects?

Allegra-d side effects?

Insomnia, jitters: Allegra d contains 2 drugs. Fexofenadine usually has few side effects, but can be drying to the nasal membranes and mouth, and can have side effects, so check further if you have some. The d portion, on the other hand, is sudafed, and it commonly causes jitters, insomnia, fast heart rate, nausea and headache. It can raise the blood pressure and cause arrhythmias. ...Read more

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I accidently took 2 24hr Allegra d how long will it stay in ur body? i been having side effects for over a week.

I accidently took 2 24hr Allegra d how long will it stay in ur body? i been having side effects for over a week.

1-3 days at most: If you are having side effects after one week since taking this dose then there must be another explanation for your symptoms. Try asking another question entering these persistent symptoms or you could see your regular doctor for an explanation. ...Read more

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I accidently took two 24hr allegra d on may 1 still have some side effects how long will the med will stay in ur system ?

I accidently took two 24hr allegra d  on may 1 still have some side effects how long will the med will stay in ur system ?

Probably 24 hrs: This dose is fine since Allegra has a high margin of safety. I do not expect much side effects at all . The biologic effect will last around a day but there may still be traces of the drug present in your body for a couple more days. ...Read more

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Fexofenadine/allegra causing bad side-effects, what to do?

Take another brand: The answer is avoidance especially when there are several other options in antihistamine available. ...Read more

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What other medications can be taken with Allegra (fexofenadine) D for colds that will not produce any negative side effects?

Common cold: if you are still congested despite taking allegra D , you may want to try saline nasal wash then briefly OTC nasal steroid spray, but read the labels well and use it right, trust that you are not hypertensive to start with while on allegra D, if no improvement see your doctor ...Read more

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What are the side effects of Allegra (fexofenadine) when is the best time to take it ?

What are the side effects of Allegra (fexofenadine) when is the best time to take it ?

Many: Allegra, (fexofenadine) or Fexofenadine, have similar side effects profile compared to other newer generation of antihistamine medications. All antihistamine medications also has anticholinergic effects, which can contribute to dizziness, sedation, urinary retention, diarrhea, muscle cramp, gastrointestinal discomfort, menstrual cramp which are related to the anticholinergic effects of the medication. ...Read more

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Are there other medicine I can take with Allegra (fexofenadine) D that won't cause bad side effects?

Are there other medicine I can take with Allegra (fexofenadine) D that won't cause bad side effects?

What medicines: Which medication you are taking that you are concerned if they are compatible with Allegra (fexofenadine) D? ...Read more

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I took an Allegra (fexofenadine) pill but didn't know it was expired till after. I'm wondering if that could cause me any side effects?

Expired allegra (fexofenadine): In general never take expired medication,some have serious effects. That being said how expired was it , a few weeks (less likely to have negative effects) versus a year( more likely)? Drugs lose potency expired. Did you take one or many? Are you thinking of hurting your self? if so please call 911 and/ or call 1800 273-8255 If only 1-3 months dont worry Poison control 1 800 222 1222 ...Read more

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I was told to take allegra (fexofenadine) d for allergies and sinus. it seems to have anxiety, paranoia, "crazy" side effect. what ingredient to avoid?

I was told to take allegra (fexofenadine) d for allergies and sinus. it seems to have anxiety, paranoia, "crazy" side effect. what ingredient to avoid?

Sure it is not D?: loratidine or a similar medication rarely cause any problem specially the one you described but the D part the decongestant could easily caused all the problem you have described if you are not taking the D kind you can try the other allergy medicine like claritin,or zyrtec or you can go directly to anti histamine and start taking benadryl (diphenhydramine) at night since it could make you sleepy. good luck ...Read more

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Fexofenadine (Definition)

Fexofenadine, previously marketed under the brand name allegra, is an antihistamine similar to ...Read more


Dr. Michael Finkelstein
379 doctors shared insights

Allegra (Definition)

Allegra is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more